2221104

Information

• Patent Grant
• 2221104

• References
• Source

• Patent Number

  2,221,104

• Date Filed

  Not available

• Date Issued

  Tuesday, November 12, 1940
  84 years ago

• CPC

  • H04N5/60 - for the sound signals
  • H03H11/342 - particularly adapted for use in common antenna systems
  • H04B1/1638 - Special circuits to enhance selectivity of receivers not otherwise provided for
  • H04B1/26 - for superheterodyne receivers

• US Classifications

  • 348 - Television
  • 333 - Wave transmission lines and networks
  • 455 - Telecommunications